/*
 * This file is part of Cadmium.
 * Copyright (C) 2007-2010 Xavier Clerc.
 *
 * Cadmium is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Cadmium is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package fr.x9c.cadmium.primitives.unix;

import fr.x9c.cadmium.kernel.CodeRunner;
import fr.x9c.cadmium.kernel.Context;
import fr.x9c.cadmium.kernel.Fail;
import fr.x9c.cadmium.kernel.FalseExit;
import fr.x9c.cadmium.kernel.Primitive;
import fr.x9c.cadmium.kernel.PrimitiveProvider;
import fr.x9c.cadmium.kernel.Value;

/**
 * This class provides implementation for 'unix_sleep' primitive.
 *
 * @author <a href="mailto:cadmium@x9c.fr">Xavier Clerc</a>
 * @version 1.0
 * @since 1.0
 */
@PrimitiveProvider
public final class Sleep {

    /**
     * No instance of this class.
     */
    private Sleep() {
    } // end empty constructor

    /**
     * Suspend thread execution.
     * @param ctxt context
     * @param t duration in seconds
     * @return <i>unit</i>
     * @throws FalseExit if another thread exits the program
     * @throws Fail.Exception if an asynchronous exception has been thrown
     */
    @Primitive
    public static Value unix_sleep(final CodeRunner ctxt,
                                   final Value t)
        throws FalseExit, Fail.Exception {
        final Context context = ctxt.getContext();
        context.enterBlockingSection();
        try {
            Thread.sleep(t.asLong() * ((int) Unix.MILLISECS_PER_SEC));
        } catch (final InterruptedException ie) {
            final FalseExit fe = FalseExit.createFromContext(context);
            fe.fillInStackTrace();
            throw fe;
        } // end try/catch
        context.leaveBlockingSection();
        return Value.UNIT;
    } // end method 'unix_sleep(CodeRunner, Value)'

} // end class 'Sleep'
